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(19) United States (12) Patent Application Publication (10) Pub US 20110096655A1 (19) United States (12) Patent Application Publication (10) Pub. N0.: US 2011/0096655 A1 MUELLER et al. (43) Pub. Date: Apr. 28, 2011 (54) FORMING LIGHT-TRANSMITTING COVER (60) Provisional application No. 60/781,085, ?led on Mar. LAYER FOR RECORDING MEDIUM 9, 2006. (75) Inventors: William R. MUELLER, . Bremwood, TN (Us); Ed Publication Classi?cation PICKUTOSKI, Blakely, PA (U S) (51) Int. Cl. GIIB 7/252 (2006.01) (73) Assignee: CINRAM INTERNATIONAL INC,’ Scarborough (CA) (52) US. Cl. .................................. .. 369/283; G9B/7.171 (21) Appl. No.: 12/965,270 (57) ABSTRACT (22) Filed: Dec‘ 10’ 2010 An optical recording medium includes a recording layer in or . on a substrate, a light-transmitting cover layer over said Related U's' Apphcatlon Data recording layer, and a disc rib over an outer periphery of a ?rst (63) Continuation-impart of application NO_ 11/715,249, side of the substrate and delimiting an outer diameter of the ?led on Mar. 6, 2007. cover layer. Patent Application Publication Apr. 28, 2011 Sheet 1 0f 4 US 2011/0096655 A1 1 Mold substrate- with information bearing side 511 Fig. 1 Form information layer over S; 3 infcrmation-bearing side of suhstrata 1 Farm saver layer over information layer 515 with disc rib over outer disc'- periphery l Patent Application Publication Apr. 28, 2011 Sheet 2 0f 4 US 2011/0096655 A1 Fig. 2B Patent Application Publication Apr. 28, 2011 Sheet 3 0f 4 US 2011/0096655 A1 21 / Fig. 2E Patent Application Publication Apr. 28, 2011 Sheet 4 0f 4 US 2011/0096655 A1 m.E EQQMMMHW @EEQU mm 2%252 wmCaU in‘E.cor?w Fm 0mm “238mm m mEHQU mow?m @m mmm miowumw: @362 US 2011/0096655 A1 Apr. 28, 2011 FORMING LIGHT-TRANSMITTING COVER ?lm (of metal or alloy) or the like, to form an information LAYER FOR RECORDING MEDIUM layer. In the case of a CD, a plastic protective coating is applied over the re?ective ?lm, and then art (for example, a CROSS-REFERENCE TO RELATED picture, a design, text, etc.) is typically printed on the upper APPLICATION surface of the disc (that is, on the side of the substrate Which [0001] This application is a continuation-in-part of Us. bears the information layer), to form an end product Which is patent application Ser. No. 11/715,249 ?led Mar. 6, 2007 1.2 mm thick. In the case of DVDs, tWo half-thickness sub Which claims the bene?t of Us. provisional application No. strates (that is, approximately 0.6 mm each) are typically 60/781,085, ?led Mar. 9, 2006. formed, metalliZation is applied to one (for example, DVD-5) or both (for example, DVD-10, DVD-9, DVD-18) half-thick TECHNICAL FIELD ness substrates, and the tWo half-thickness substrates are bonded by an adhesive (for example, hotmelt adhesive, ultra [0002] This application relates to optical storage media. In violet light-cured adhesive, etc.), With the information layer particular, the application relates to a method for forming a being shielded from the external environment by the half thin light-transmitting cover layer over an information layer thickness substrates as cover layers. A second information for an optical recording medium. layer can be formed for a DVD (for example, DVD-18) by applying a photo-polymer coating over a metalliZation layer DESCRIPTION OF RELATED ART applied to a substrate and the second information layer is [0003] Use of CDs (compact discs) and DVDs (digital ver embossed by a stamper into the photo-polymer layer Which is satile discs or digital video discs) as optical storage media then UV cured, metalliZed and protective coated. (“optical disc”) for storing and transporting content (such as [0006] Recordable type optical media typically include a audio, video, graphics, computer software, etc.) in an opti spiral Wobble groove in the substrate. The groove de?nes cally readable manner has beenpopular for a number of years. recording channels on the disc for recording data, provides Several formats of optical discs are currently available, information for tracking of the disc While Writing or reading including (A) read-only formats such as CD-DA (digital data, and has its Wobble frequency modulated to contain audio compact disc), CD-ROM (CD-read-only memory), addressing and other information for the Write and read pro DVD-ROM, and other formats Wherein content is pre-re cesses. The substrate (including information layerbearing the corded on the disc (such as by using an injection molding spiral Wobble groove) can be formed by injection molding, process), and (B) recordable formats in the form of (i) Write using a stamper electroformed With a glass master. In addi once read-many times formats such as CD-R (CD-record tion, recordable-type optical media generally include at least able), and DVDIR (DVD-recordable), etc., or (ii) reWritable a recording layer, and in addition a re?ective layer (of metal or formats such as CD-RW (CD-reWriteable), DVD-RAM alloy) and a protective layer. Information is recorded in the (DVD-Random Access Media), DVD-RW or DVD+RW recordable-type optical medium by directing a laser light DVD-reWriteable) PD (Phase change Dual disk) and other beam modulated by signals to selectively change optical char phase change optical discs. acteristics (re?ectivity or extinction coe?icient) of the record [0004] In conventional read-only type optical discs (for ing layer. The recording layer in Write-once read-many times example, CD-ROM, DVD-ROM, etc.), data is generally optical media typically includes a photosensitive organic dye stored as a series of “pits” embossed in a plane of “lands”. Which is heated during recording to form irreversibly a pat Microscopic pits formed in a surface of a plastic medium [for tern of marks or pits in the recording layer. example, polycarbonate or polymethyl methacrylate [0007] Each recording side of a reWritable disc also uses (PMMA)] are arranged in tracks, conventionally spaced radi multiple layers beginning With a polycarbonate plastic sub ally from the center hub in a spiral track originating at the strate containing a shalloW spiral groove extending from the medium center hub and ending toWard the medium’s outer inside to the outside diameter of the disc.A DVD-RW disc (or rim. The light re?ected from a read-only medium’s surface by a DVD-RAM disc) may additionally inside the groove itself. an optical disc player or reader varies according to the pres The substrates (including information layer bearing the spiral ence or absence of pits along the information track. A photo groove, land pre-pits and embossed areas) may be formed by detector and other electronics inside the optical disc player injection molding, using a stamper electroformed With a glass translate the signal from the transition points betWeen these master. Next in the multiple layers of a reWritable disc typi pits and lands caused by this variation into the 0s and 1s of the cally comes a dielectric layer, folloWed by a phase-change digital code representing the stored information. type recording layer having a polycrystalline structure, [0005] Read-only type optical discs generally are produced another dielectric layer and a re?ective layer (of metal or by an injection molding process. Initially, data representing alloy). Additional layers may also be incorporated above or the content to be recorded, encoded as a run length limited beloW the dielectric layer, With a protective coating being digital code (commonly knoWn as an EFM signal in CD applied as a last layer in single-sided optical media. During manufacturing) Which contains its digital information in the recording of the reWritable optical medium, the laser selec timing betWeen transitions, is used to control a laser beam tively heats tiny areas of the recording track to change the recorder to form pits in a photoresist or a dye-polymer layer phase of each heated area from more crystalline into less on an optical grade glass disc knoWn as a glass master in a crystalline (also knoWn as “amorphous”) phase, in order to mastering process. A metalliZed glass master is used in an create marks that can be called “pits” (the term “pit” is used electroforming process to form (typically, metal) stampers. A broadly herein to cover, for example, a pit in a read-only type stamper is used on one side of an injection molding cavity to optical disc, and a pit or mark in a recordable or reWritable emboss a layer of pits and lands on a transparent polymer optical disc). During erase, the laser (in a process called substrate formed by injection molding. The information bear “annealing”) changes the amorphous areas back into more ing surface of the substrate is then covered With a re?ective crystalline areas. US 2011/0096655 A1 Apr. 28, 2011 [0008] Some exemplary optical disc manufacturing tech the light-transmitting property of the cover layer. In addition, niques (including methods, systems and apparatuses) are dis spin coating techniques typically apply much more resin than cussed in US. Pat. Nos. 5,181,081, 5,315,107, 5,766,495, is required to form the 0.1 mm cover layer, and the excess 5,792,538, 5,900,098, 5,932,042, 5,932,051, 5,932,058, must be collected to avoid Waste. 5,935,673, 5,949,752, 5,958,651, 5,995,481, 5,997,976, [0016] There is a need for improved techniques for forming 6,117,284, 6,124,011, 6,160,787, 6,309,496, 6,309,727, a light-transmitting cover layer Which does not have the limi 6,361,845, 6,440,248, 6,527,538, 6,726,973 and 6,896,829, tations described above.
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